/Engine/Source/Runtime/Foliage/Public/ProceduralFoliageComponent.h
Removes all spawned foliage instances in the level that were spawned by this component
static void RemoveProceduralContent ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, const [FGuid](API\Runtime\Core\Misc\FGuid) & InProceduralGuid, bool bInRebuildTree, [TSet](API\Runtime\Core\Containers\TSet)< [AInstancedFoliageActor](API\Runtime\Foliage\AInstancedFoliageActor) * > & OutModifiedActors )